[gtkmm: 1/2] Fix DropDown strings constructor

[Kjell Ahlstedt <kjellahl src gnome org>]

commit f8e8c9b4b0052cc1919ce676b275b798ad5f1f0f
Author: Andreas Persson <andreasp56 outlook com>
Date:   Sat Aug 1 18:33:06 2020 +0200

    Fix DropDown strings constructor

 gtk/src/dropdown.ccg | 11 +++++++++++
 gtk/src/dropdown.hg  | 14 +++++++++-----
 2 files changed, 20 insertions(+), 5 deletions(-)
---
diff --git a/gtk/src/dropdown.ccg b/gtk/src/dropdown.ccg
index 57b87fdc..d2d53da3 100644
--- a/gtk/src/dropdown.ccg
+++ b/gtk/src/dropdown.ccg
@@ -15,3 +15,14 @@
  */
 
 #include <gtk/gtk.h>
+#include <stringlist.h>
+
+namespace Gtk
+{
+
+DropDown::DropDown(const std::vector<Glib::ustring>& strings)
+:
+  _CONSTRUCT("model", StringList::create(strings)->gobj())
+{}
+
+}
diff --git a/gtk/src/dropdown.hg b/gtk/src/dropdown.hg
index c0bb546a..ba917907 100644
--- a/gtk/src/dropdown.hg
+++ b/gtk/src/dropdown.hg
@@ -36,9 +36,9 @@ namespace Gtk
  * and expects to obtain these from the model by evaluating an expression
  * that has to be provided via set_expression().
  *
- * The convenience method set_from_strings() can be used to set up a
- * model that is populated from an array of strings and an expression
- * for obtaining those strings.
+ * %Gtk::DropDown knows how to obtain strings from the items in a
+ * Gtk::StringList; for other models, you have to provide an expression
+ * to find the strings.
  *
  * %Gtk::DropDown can optionally allow search in the popup, which is
  * useful if the list of options is long. To enable the search entry,
@@ -61,8 +61,12 @@ class GTKMM_API DropDown : public Widget
 
 public:
   _CTOR_DEFAULT
-#m4 _CONVERSION(`const std::vector<Glib::ustring>&',`const 
char*-const*',`Glib::ArrayHandler<Glib::ustring>::vector_to_array($3).data()')
-  _WRAP_CTOR(DropDown(const std::vector<Glib::ustring>& strings), gtk_drop_down_new_from_strings)
+
+  /** Creates a new %DropDown that is populated with the strings in @a strings.
+   *
+   * @param strings The strings to put in the dropdown.
+   */
+  explicit DropDown(const std::vector<Glib::ustring>& strings);
 
   _WRAP_METHOD(void set_model(const Glib::RefPtr<Gio::ListModel>& model), gtk_drop_down_set_model)
   _WRAP_METHOD(Glib::RefPtr<Gio::ListModel> get_model(), gtk_drop_down_get_model, refreturn)